Engine



Dec. 25, 1934. A. 'J. MEYER 1,985,296

ENGINE Filed April 30, 1930 I N VEN TOR.

flnire J.Me ye7: BY

A TTORNEY.

Patented Dec. 25, 1934 UNITED j'sTATes PATENT, OFFICE.

. ENGINE Andre J. "Meyer, Detroit, Mich.,' assignor 'to'Continental Motors Corporatiom'D etroit, Mich., a

corporation of: Virginia f I Application April 30, 1930,=Serial No. 448,692

7 8 Claims. (01.74-574) My invention relates to, vibration dampers are provided with the flanged hub portions 16, adapted for assembly with the crankshaft of an the'extreme outer portions of which are reduced internal combustion engine, and more particularin diameter to have a bearing on the driving ly to a vibration damper constructed and arhub. The inner portions of the hub portions are ranged to absorb the torsional vibrations of the spaced radially of the driving hub to provide an 5 engine crankshaft. annular chamber 17 surrounding the hub.

Some difiiculty has been experienced in the Means for yieldingly connecting the inertia past in constructing a torsional vibration damper member with the driving hub are housed within which will uniformly dampen out vibrations at this annular chamber. This yielding connecting various engine speeds and in which wear of the means comprises a pair of oppositely coiled springs 1 various damper elements is held to aminimum. lilyeach having one end turned out as at 19 and It is the object of my present invention to overanchored in a recess 20 carried by the discs 12A. come the difficulties mentioned above by provid- The springs are coiled around the driving hub ing a vibration damper that will effectively and and yieldingly grip the same. Thus, it will be uniformly dampen out crankshaft vibrations at noted that one end of each spring is anchored or 15 various engine speeds. fixed to the inertia member while the other end Another object of my invention is to reduce of each spring is yieldingly engaged with the wear of the damper parts to a mim'mum by prohub. Each disc 12A is provided with a hole 21 viding a yield'able' means for connecting the inin which a suitable tool may be inserted and the ertia member with'the driving hub and which discs moved relative to each other to partially 20 yields internally instead of slipping with respect set the coil springs for creating a predetermined to the adjoining damper part to which it is 'yield' pressure or force in the springs that yieldingly ingly connected. i engage the driving hub. When the required A further object of my-invention is to reduce force hasbeen obtained the bolts 13 may be asthe manufacturing costs of a crankshaft vibrasembled to secure the discs together. Preferably 25' tion damper by providing a simplified damper a sheet metal pulley structure 22 is secured to structureof ajminimum number of parts which these discs by the same bolts which fasten the may be very readily and conveniently assembled discs together. 1

together and to'the engine crankshaft. The drivinghub may be provided with a pair For a more detailed understanding of my in-- of spaced annular grooves 23 in which split 30- vention, reference may be had to the accompany spring circlips 24 may be snapped for securing ing drawing which illustrates one form which my the inertia member on the driving hub. invention may assume, and in which: It will be noted that relative movement be- Fig. 1 is a longitudinal sectional View of a Vibratween the inertia member and driving hub in one tion damper constructed in accordance with my direction will cause one of the coil springs to 35 invention and showing the same secured to an enwind up around the hub and more firmly grip the gine crankshaft, same, while the other spring is unwound from Fig. 2 is a transverse sectional view thereof the hub. Relative movement between the intaken substantially on the line 2-2 of Fig. 1, and ertia member and driving hub in the opposite Fig. 3 is another transverse sectional view taken direction will reverse the above described spring 40 substantially on the line 3-3 of Fig. 1. action. Thus vibrations in the crankshaft will I have illustrated my vibration damper as sebe absorbed by the springs, an acceleration of cured to the forward end of an engine crankshaft the inertia member being absorbed by one spring 10, a starter element 11 being secured to the end while a de-acceleration of the inertia member of the crankshaft in the usual manner, and servwill be absorbed by the other spring. 45 ing to retain the vibration damper structure on The end portion of each spring which yieldingthe crankshaft. My improved vibration damper. ly engages the driving hub, grips the hub with structure A comprises an inertia member 12 prefsufficient force to prevent the same from sliperably constructed of a pair of complementary ping thereby substantially reducing wear to a sheet metal discs 12-A or flywheel members seminimum. As more tension is imparted to one 5Ov cured together back to back by means of bolts spring or the other due to the winding up of 13 or other Suitable fasten n d vices- A driving the spring, the spring thus energized more firmly hub 14 is fixed to the crankshaft by means of a grips the hub. key 15, the inertia member being preferably rotat- Although I have illustrated but one form of ably supported on the driving hub. The discs 12A my invention and have described in detail but a 55 one of said members and the other end yieldingly'" engaging the other member for. providing a yielding driving connection between said members, relative movement of said members in one direction acting to uncoil one of said coil springs and relative movement of said members in the other direction acting to uncoil the other of said coil springs.

2. A vibration damper for engine crankshafts, comprising a driving hub member fixed to the crankshaft, an inertia member and. a pair of 0p.- positely wound coil springs surrounding said driving hub and each having one end fixed to the inertia member and the other end yieldingly engaging the hub to provide a yielding driving connection between the hub and inertia member.

3. A vibration damper for engine crankshafts, comprising a driving hub member fixed to the crankshaft, an inertia member, and a pair of op positely wound coil springs spirally coiled around said hub, the adjacent ends of each spring fixed to the inertia member and the end portions of the spring most remote from each other yieldingly engaging the hub to provide a yielding driving connection between the hub and inertia member.

4. A vibration damper for engine crankshafts, comprising a driving hub member fixed to the crankshaft, an inertia member, and apair of coil spring elements around said hub and each having one end fixed to the inertia member and the other end yieldingly engaged with said hub, said spring elements constructed. and arranged to be actuated in response to relative movement between the hub and inertia member, such relative movement in one direction actuatingone of said spring elements to wind the same on said hub while unwinding the other spring element on said hub, while such relative movement in the opposite direction unwinds the first mentioned spring element on said hub and winds the secondly mentioned spring element on said hub.

5. A vibration damper for engine crankshafts, comprising a driving hub member fixed to the crankshaft, an inertia member, and a pair of coiled springs each having one end fixed to the inertia member and the other end portion yieldingly engaged with the hub, one spring being constructed to wind up on said hub in response to relative movement of hub and inertia member in one direction and the other spring being constructed to wind up on said hub in response to relative movement of hub and inertia member in the opposite direction.

6. 'Avibration damper for engine crankshafts comprising a driving hub fixed to the crankshaft, an inertia member rotatably supported on said hub and constructed to provide an annular chamber surrounding said hub, and a pair of oppositely coiled spring elements located within said annular chamber and surrounding the hub and each having one end fixed, to the inertia. member and the other end yieldingly engaged with said hub.

7. A vibration damper for engine crankshafts, comprising a; driving hub member fixed to the crankshaft against relative rotation, an inertia member rotatably mounted on said'driving hub member,-and means providing a yielding drivingv connection between said members, said means including separate yieldable elements, one of said elements coiled around the driving hub actuated in response to relative movement of the members in one direction and the other element actuated in response to relative movement of the members in the opposite direction, said elements each having one end fixed to one of said members and the other end yieldingly engaged with said other member.

8. A vibration. damper for engine crankshafts, comprising a driving hub member fixed to the crankshaft against relative rotation, an inertia member rotatably mounted on said'driving hub member, said means including separatev coil. 

